Touch panel and display device using the same

ABSTRACT

A touch panel includes a first electrode plate and a second electrode plate separated from the first electrode plate. The first electrode plate includes a first substrate and a first conductive layer located on a lower surface of the first substrate. The second electrode plate includes a second substrate and a second conductive layer located on an upper surface of the second substrate. At least one of the first conductive layer and the second conductive layer includes at least two stacked carbon nanotube layers, each carbon nanotube layer comprising a plurality of carbon nanotubes aligned in a single direction, and the carbon nanotubes in the two adjacent carbon nanotube layers arranged along different directions. A display device adopting the touch panel includes the touch panel and a display element.

RELATED APPLICATIONS

This application is related to commonly-assigned applications entitled,“TOUCH PANEL”, filed ______ (Atty. Docket No. US17449); “TOUCH PANEL”,field ______ (Atty. Docket No. US17448); “TOUCH PANEL AND DISPLAY DEVICEUSING THE SAME”, field ______ (Atty. Docket No. US17861); “TOUCH PANELAND DISPLAY DEVICE USING THE SAME”, field ______ (Atty. Docket No.US17818); “TOUCH PANEL AND DISPLAY DEVICE USING THE SAME”, field ______(Atty. Docket No. US17820); “TOUCH PANEL AND DISPLAY DEVICE USING THESAME”, field ______ (Atty. Docket No. US17862); “TOUCH PANEL AND DISPLAYDEVICE USING THE SAME”, field ______ (Atty. Docket No. US17863); “TOUCHPANEL AND DISPLAY DEVICE USING THE SAME”, field ______ (Atty. Docket No.US18263); “TOUCHABLE CONTROL DEVICE”, field ______ (Atty. Docket No.US18262); “TOUCH PANEL AND DISPLAY DEVICE USING THE SAME”, field ______(Atty. Docket No. US17889); “TOUCH PANEL AND DISPLAY DEVICE USING THESAME”, field ______ (Atty. Docket No. US17888); “TOUCH PANEL AND DISPLAYDEVICE USING THE SAME”, field ______ (Atty. Docket No. US17885); “TOUCHPANEL AND DISPLAY DEVICE USING THE SAME”, field ______ (Atty. Docket No.US17886); “TOUCH PANEL, METHOD FOR MAKING THE SAME, AND DISPLAY DEVICEADOPTING THE SAME”, field ______ (Atty. Docket No. US17887); “TOUCHPANEL AND DISPLAY DEVICE USING THE SAME”, field ______ (Atty. Docket No.US17864); “TOUCH PANEL, METHOD FOR MAKING THE SAME, AND DISPLAY DEVICEADOPTING THE SAME”, field ______ (Atty. Docket No. US17865); “TOUCHPANEL AND DISPLAY DEVICE USING THE SAME”, field ______ (Atty. Docket No.US18266); “TOUCH PANEL AND DISPLAY DEVICE USING THE SAME”, field ______(Atty. Docket No. US18257); “METHOD FOR MAKING TOUCH PANEL”, field______ (Atty. Docket No. US18069); “METHOD FOR MAKING TOUCH PANEL”,field ______ (Atty. Docket No. US18068); “TOUCH PANEL AND DISPLAY DEVICEUSING THE SAME”, field ______ (Atty. Docket No. US17841); “TOUCH PANELAND DISPLAY DEVICE USING THE SAME”, field ______ (Atty. Docket No.US17859); “TOUCH PANEL AND DISPLAY DEVICE USING THE SAME”, field ______(Atty. Docket No. US17860); “TOUCH PANEL AND DISPLAY DEVICE USING THESAME”, field ______ (Atty. Docket No. US17857); “TOUCH PANEL AND DISPLAYDEVICE USING THE SAME”, field ______ (Atty. Docket No. US18258); “TOUCHPANEL AND DISPLAY DEVICE USING THE SAME”, field ______ (Atty. Docket No.US18264); “TOUCH PANEL AND DISPLAY DEVICE USING THE SAME”, field ______(Atty. Docket No. US18267); “TOUCH PANEL, METHOD FOR MAKING THE SAME,AND DISPLAY DEVICE ADOPTING THE SAME”, field ______ (Atty. Docket No.US17839); “ELECTRONIC ELEMENT HAVING CARBON NANOTUBES”, filed ______(Atty. Docket No. US18066); and “TOUCH PANEL, METHOD FOR MAKING THESAME, AND DISPLAY DEVICE ADOPTING THE SAME”, field ______ (Atty. DocketNo. US17858). Disclosures of the above-identified applications areincorporated herein by reference.

BACKGROUND

1. Field of the Invention

The present invention relates to touch panels and, particularly, to acarbon nanotube based touch panel and a display device adopting thesame.

2. Discussion of Related Art

Following the advancement in recent years of various electronicapparatuses, such as mobile phones, car navigation systems and the like,toward high performance and diversification, there has been continuousgrowth in the number of electronic apparatuses equipped with opticallytransparent touch panels at the front of their respective displaydevices (e.g., liquid crystal panels). A user of any such electronicapparatus operates it by pressing or touching the touch panel with afinger, a pen, a stylus, or a like tool while visually observing thedisplay device through the touch panel. Therefore, a demand exists fortouch panels that are superior in visibility and reliable in operation.

At present, different types of touch panels, including resistance,capacitance, infrared, and surface sound-wave types have been developed.Due to their high accuracy and low cost of production, resistance-typetouch panels have been widely used.

A conventional resistance-type touch panel includes an upper substrate,a transparent upper conductive layer formed on a lower surface of theupper substrate, a lower substrate, a transparent lower conductive layerformed on an upper surface of the lower substrate, and a plurality ofdot spacers formed between the transparent upper conductive layer andthe transparent lower conductive layer. The transparent upper conductivelayer and the transparent lower conductive layer are formed ofelectrically conductive indium tin oxide (ITO).

In operation, an upper surface of the upper substrate is pressed with afinger, a pen, or a like tool, and visual observation of a screen on theliquid crystal display device provided on a back side of the touch panelis provided. This causes the upper substrate to be deformed, and theupper conductive layer thus comes in contact with the lower conductivelayer at the position where the pressing occurs. Voltages are separatelyapplied by an electronic circuit to the transparent upper conductivelayer and the transparent lower conductive layer. Thus, the deformedposition can be detected by the electronic circuit.

Each of the transparent conductive layers (e.g., ITO layers) isgenerally formed by means of ion-beam sputtering, and this method isrelatively complicated. Additionally, the ITO layer has poorwearability/durability, low chemical endurance, and uneven resistanceover an entire area of the touch panel. Furthermore, the ITO layer hasrelatively low transparency. All the above-mentioned problems of the ITOlayer make for a touch panel with low sensitivity, accuracy, andbrightness.

What is needed, therefore, is to provide a durable touch panel and adisplay device using the same with high sensitivity, accuracy, andbrightness.

SUMMARY OF THE INVENTION

In one embodiment, a touch panel includes a first electrode plate, and asecond electrode plate separated from the first electrode plate. Thefirst electrode plate includes a first substrate and a first conductivelayer located on a lower surface of the first substrate. The secondelectrode plate includes a second substrate and a second conductivelayer located on an upper surface of the second substrate. At least oneof the first conductive layer and the second conductive layer includesat least two stacked carbon nanotube layers. Each carbon nanotube layerincludes one or more carbon nanotube films. Each carbon nanotube filmincludes a plurality of carbon nanotubes arranged along a samedirection. The carbon nanotubes in the adjacent two carbon nanotubelayers are arranged along different directions.

Other novel features and advantages of the present touch panel anddisplay device using the same will become more apparent from thefollowing detailed description of exemplary embodiments when taken inconjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

Many aspects of the present touch panel and display device using thesame can be better understood with reference to the following drawings.The components in the drawings are not necessarily to scale, theemphasis instead being placed upon clearly illustrating the principlesof the present touch panel and display device using the same.

FIG. 1 is an exploded, isometric view of a touch panel in accordancewith a present embodiment, showing a first substrate thereof inverted.

FIG. 2 is a transverse, cross-sectional view of the touch panel of FIG.1 once assembled.

FIG. 3 shows a Scanning Electron Microscope (SEM) image of a carbonnanotube film used in the touch panel of FIG. 1.

FIG. 4 is a structural schematic of a carbon nanotube segment.

FIG. 5 is essentially a schematic cross-sectional view of the touchpanel of the present embodiment used with a display element of a displaydevice, showing operation of the touch panel with a touch tool.

Corresponding reference characters indicate corresponding partsthroughout the several views. The exemplifications set out hereinillustrate at least one embodiment of the present touch panel anddisplay device using the same, in at least one form, and suchexemplifications are not to be construed as limiting the scope of theinvention in any manner.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

Reference will now be made to the drawings to describe, in detail,embodiments of the present touch panel and display device using thesame.

Referring to FIG. 1 and FIG. 2, a touch panel 10 includes a firstelectrode plate 12, a second electrode plate 14, and a plurality of dotspacers 16 located between the first electrode plate 12 and the secondelectrode plate 14.

The first electrode plate 12 includes a first substrate 120, a firstconductive layer 122, and two first-electrodes 124. The first substrate120 includes an upper surface and a lower surface, each of which issubstantially flat. The two first-electrodes 124 and the firstconductive layer 122 are located on the lower surface of the firstsubstrate 120. The two first-electrodes 124 are located separately onopposite ends of the first conductive layer 122. A direction from one ofthe first-electrodes 124 across the first conductive layer 122 to theother first-electrode 124 is defined as a first direction. The twofirst-electrodes 124 are electrically connected with the firstconductive layer 122.

The second electrode plate 14 includes a second substrate 140, a secondconductive layer 142, and two second-electrodes 144. The secondsubstrate 140 includes an upper surface and a lower surface, each ofwhich is substantially flat. The two second-electrodes 144 and thesecond conductive layer 142 are located on the upper surface of thesecond substrate 140. The two second-electrodes 144 are locatedseparately on opposite ends of the second conductive layer 142. Adirection from one of the second-electrodes 144 across the secondconductive layer 142 to the other second-electrode 144 is defined as asecond direction. The two second-electrodes 144 are electricallyconnected with the second conductive layer 142.

The first direction is perpendicular to the second direction. That is,the two first-electrodes 124 are aligned parallel to the seconddirection, and the two second-electrodes 144 aligned parallel to thefirst direction. The first substrate 120 is a transparent and flexiblefilm or plate. The second substrate 140 is a transparent plate. Thefirst-electrodes 124 and the second-electrodes 144 are made of metal orany other suitable material. In the present embodiment, the firstsubstrate 120 is a polyester film, the second substrate 140 is a glassplate, and the first-electrodes 124 and second-electrodes 144 are madeof a conductive silver paste.

An insulative layer 18 is provided between the first and the secondelectrode plates 12 and 14. The first electrode plate 12 is located onthe insulative layer 18. The first conductive layer 122 is opposite to,but is spaced from, the second conductive layer 142. The dot spacers 16are separately located on the second conductive layer 142. A distancebetween the second electrode plate 14 and the first electrode plate 12is in an approximate range from 2 to 20 microns. The insulative layer 18and the dot spacers 16 are made of, for example, insulative resin or anyother suitable insulative material. Insulation between the firstelectrode plate 12 and the second electrode plate 14 is provided by theinsulative layer 18 and the dot spacers 16. It is to be understood thatthe dot spacers 16 are optional, particularly when the touch panel 10 isrelatively small. They serve as supports given the size of the span andthe strength of the first electrode plate 12.

A transparent protective film 126 is located on the upper surface of thefirst electrode plate 12. The material of the transparent protectivefilm 126 can be selected from a group consisting of silicon nitrides,silicon dioxides, benzocyclobutenes, polyester films, and polyethyleneterephthalates. The transparent protective film 126 can be made of slickplastic and receive a surface hardening treatment to protect the firstelectrode plate 12 from being scratched when in use.

At least one of the first conductive layer 122 and the second conductivelayer 142 includes at least two stacked carbon nanotube layers. Thecarbon nanotubes in the adjacent two carbon nanotube layers are alignedin different directions. An angle between the aligned directions of thecarbon nanotubes in the two adjacent carbon nanotube layers is in anapproximate range from above 0° to less than or equal to 90° (i.e.,0<α≦90°). The carbon nanotube layer can be comprised of a transparentcarbon nanotube film or a plurality of carbon nanotube filmscontactingly disposed side by side. Referring to FIGS. 3 and 4, eachcarbon nanotube film comprises a plurality of successively orientedcarbon nanotube segments 143 joined end-to-end by van der Waalsattractive force therebetween. In one embodiment, there may be someoverlap between adjacent segments. Each carbon nanotube segment 143includes a plurality of carbon nanotubes 145 parallel to each other, andcombined by van der Waals attractive force therebetween. The carbonnanotube segments 143 can vary in width, thickness, uniformity andshape. The carbon nanotubes 145 in the carbon nanotube film 143 aresubstantially oriented along a preferred orientation. A length and awidth of the carbon nanotube film can be arbitrarily set as desired. Athickness of the carbon nanotube film is in an approximate range from0.5 nanometers to 100 micrometers.

In one suitable embodiment, the first conductive layer 122 and thesecond conductive layer 142 both include, at a minimum, two carbonnanotube layers. The carbon nanotubes in the adjacent two layers ofcarbon nanotube layer are oriented along different directions. The anglebetween the aligned directions of the carbon nanotubes 145 in the twoadjacent carbon nanotube layers is 90°.

A method for fabricating an above-described carbon nanotube filmincludes the steps of: (a) providing an array of carbon nanotubes, or,providing a super-aligned array of carbon nanotubes; (b) pulling out acarbon nanotube film from the array of carbon nanotubes, by using a tool(e.g., adhesive tape, pliers, tweezers, or another tool allowingmultiple carbon nanotubes to be gripped and pulled simultaneously).

In step (a), a given super-aligned array of carbon nanotubes can beformed by the substeps of: (a1) providing a substantially flat andsmooth substrate; (a2) forming a catalyst layer on the substrate; (a3)annealing the substrate with the catalyst layer in air at a temperaturein an approximate range from 700° C. to 900° C. for about 30 to 90minutes; (a4) heating the substrate with the catalyst layer to atemperature in the approximate range from 500° C. to 740° C. in afurnace with a protective gas therein; and (a5) supplying a carbonsource gas to the furnace for about 5 to 30 minutes and growing thesuper-aligned array of carbon nanotubes on the substrate.

In step (a1), the substrate can, beneficially, be a P-type siliconwafer, an N-type silicon wafer, or a silicon wafer with a film ofsilicon dioxide thereon. A 4-inch P-type silicon wafer is used as thesubstrate in the present embodiment.

In step (a2), the catalyst can, advantageously, be made of iron (Fe),cobalt (Co), nickel (Ni), or any alloy thereof.

In step (a4), the protective gas can, beneficially, be made up of atleast one of nitrogen (N₂), ammonia (NH₃), and a noble gas. In step(a5), the carbon source gas can be a hydrocarbon gas, such as ethylene(C₂H₄), methane (CH₄), acetylene (C₂H₂), ethane (C₂H₆), or anycombination thereof.

The super-aligned array of carbon nanotubes can, opportunely, have aheight of about 50 microns to 5 millimeters and include a plurality ofcarbon nanotubes 145 parallel to each other and approximatelyperpendicular to the substrate. The carbon nanotubes 145 in the array ofcarbon nanotubes can be multi-walled carbon nanotubes, double-walledcarbon nanotubes or single-walled carbon nanotubes. Diameters of thesingle-walled carbon nanotubes approximately range from 0.5 to 50nanometers. Diameters of the double-walled carbon nanotubesapproximately range from 1 to 50 nanometers. Diameters of themulti-walled carbon nanotubes approximately range from 1.5 to 50nanometers.

The super-aligned array of carbon nanotubes formed under the aboveconditions is essentially free of impurities such as carbonaceous orresidual catalyst particles. The carbon nanotubes 145 in thesuper-aligned array are closely packed together by van der Waalsattractive force therebetween.

In step (b), the carbon nanotube film can be formed by the substeps of:(b1) selecting a one or more carbon nanotubes having a predeterminedwidth from the array of carbon nanotubes; and (b2) pulling the carbonnanotubes to form nanotube segments 143 at an even/uniform speed toachieve a uniform carbon nanotube film.

In step (b1), the carbon nanotube segment 143 includes a plurality ofcarbon nanotubes 145 parallel to each other. The carbon nanotubesegments 143 can be selected by using an adhesive tape as the tool tocontact the super-aligned array of carbon nanotubes. In step (b2), thepulling direction is substantially perpendicular to the growingdirection of the super-aligned array of carbon nanotubes. It is to beunderstood that some variation can occur in the orientation of thenanotubes in the film as can be seen in FIG. 3.

More specifically, during the pulling process, as the initial carbonnanotube segments 143 are drawn out, other carbon nanotube segments 143are also drawn out end to end due to van der Waals attractive forcebetween ends of adjacent carbon nanotube segments 143. This process ofdrawing ensures a substantially continuous and uniform carbon nanotubefilm can be formed.

The carbon nanotube film includes a plurality of carbon nanotubesegments 143. The carbon nanotubes 145 in the carbon nanotube film areall substantially parallel to the pulling/drawing direction of thecarbon nanotube film, and the carbon nanotube film produced in suchmanner can be selectively formed having a predetermined width. Thecarbon nanotube film formed by the pulling/drawing method has superioruniformity of thickness and conductivity over a disordered carbonnanotube film. Further, the pulling/drawing method is simple, fast, andsuitable for industrial applications.

In the present embodiment, each carbon nanotube layer only includes asingle carbon nanotube film. Each carbon nanotube film comprises aplurality of carbon nanotube segments 143; which are in turn comprisedof a plurality of carbon nanotubes 145 arranged along a same direction.The direction is generally the pulling direction. As such, at least twocarbon nanotube layers are arranged and stacked with the angle a betweenthe orientation of the nanotubes 145, wherein 0<α≦90°. By applying anangle to the alignment direction, the strength of the stacked layers asa hole is improved.

The width of the carbon nanotube film depends on a size of the carbonnanotube array. The length of the carbon nanotube film can bearbitrarily set, as desired. In one useful embodiment, when thesubstrate is a 4-inch type wafer as in the present embodiment, the widthof the carbon nanotube film approximately ranges from 0.5 nanometers to10 centimeters, and the thickness thereof approximately ranges from 0.5nanometers to 100 micrometers. The carbon nanotubes 145 in the carbonnanotube film can be selected from a group consisting of single-walledcarbon nanotubes, double-walled carbon nanotubes, and multi-layer carbonnanotubes. Diameters of the single-walled carbon nanotubes approximatelyrange from 0.5 to 50 nanometers. Diameters of the double-walled carbonnanotubes approximately range from 1 to 50 nanometers. Diameters of themulti-walled carbon nanotubes approximately range from 1.5 to 50nanometers.

It is noted that because the carbon nanotubes 145 in the super-alignedcarbon nanotube array have a high purity and a high specific surfacearea, the carbon nanotube film is adherent in nature. As such, thecarbon nanotube film can be adhered directly to a surface of the firstsubstrate 120 or the second substrate 140, and/or another carbonnanotube film. In the alternative, other bonding means can be applied.

The carbon nanotube film, once adhered to a surface of the firstsubstrate 120 or the second substrate 140 can be treated with an organicsolvent. The carbon nanotube film can be treated by dropping the organicsolvent from a dropper to soak the entire surface of the carbon nanotubefilm. The organic solvent is volatilizable and can, suitably, beselected from the group consisting of ethanol, methanol, acetone,dichloroethane, chloroform, and combinations thereof. In the presentembodiment, the organic solvent is ethanol. After being soaked by theorganic solvent, microscopically, carbon nanotube strings will be formedby adjacent carbon nanotubes in the carbon nanotube film, that are ableto do so, bundling together, due to the surface tension of the organicsolvent. In one aspect, part of the carbon nanotubes in the untreatedcarbon nanotube film that are not adhered on the substrate will adhereon the substrate 120,140 after the organic solvent treatment due to thesurface tension of the organic solvent. Then the contacting area of thecarbon nanotube film with the substrate will increase, and thus, thecarbon nanotube film can firmly adhere to the surface of the firstsubstrate 120,140. In another aspect, due to the decrease of thespecific surface area via the bundling, the mechanical strength andtoughness of the carbon nanotube film are increased and the coefficientof friction of the carbon nanotube films is reduced. Macroscopically,the film will be an approximately uniform carbon nanotube film.

The touch panel 10 can further include a shielding layer (not shown)located on the lower surface of the second substrate 140. The materialof the shielding layer can be indium tin oxide, antimony tin oxide,carbon nanotube film, and other conductive materials. In the presentembodiment, the shielding layer is a carbon nanotube film. The carbonnanotube film includes a plurality of carbon nanotubes 145, and theorientation of the carbon nanotubes 145 therein can be arbitrary orarranged along a same direction. The carbon nanotube film is connectedto the ground and plays a role of shielding and, thus, enables the touchpanel 10 to operate without interference (e.g., electromagneticinterference).

Referring to FIG. 5, a display device 100 includes the touch panel 10, adisplay element 20, a first controller 30, a central processing unit(CPU) 40, and a second controller 50. The touch panel 10 is opposite andadjacent to the display element 20, and is connected to the firstcontroller 30 by an external circuit. The touch panel 10 can be spacedfrom the display element 20 or installed directly on the display element20. In the illustrated embodiment, the touch panel 10 is spaced from thedisplay element 20, with a gap 26. The first controller 30, the CPU 40,and the second controller 50 are electrically connected. The CPU 40 isconnected to the second controller 50 to control the display element 20.

The display element 20 can be, e.g., a liquid crystal display, a fieldemission display, a plasma display, an electroluminescent display, avacuum fluorescent display, a cathode ray tube, or another displaydevice.

When a shielding layer 22 is located on the lower surface of the secondsubstrate 140, a passivation layer 24 is located on a surface of theshielding layer, on the side away from the second substrate 140. Thematerial of the passivation layer 24 can, for example, be siliconnitride or silicon dioxide. The passivation layer 24 can be spaced fromthe display element 20 a certain distance or can be installed on thedisplay element 20. The passivation layer 24 can protect the shieldinglayer 22 from chemical or mechanical damage.

In operation, 5V are applied to each of the two first-electrodes 124 ofthe first electrode plate 12 and to each of the two second-electrodes144 of the second electrode plate 14. A user operates the display bypressing the first electrode plate 12 of the touch panel 10 with afinger, a pen/stylus 60, or the like while visually observing thedisplay element 20 through the touch panel 10. This pressing causes adeformation 70 of the first electrode plate 12. The deformation 70 ofthe first electrode plate 12 causes a connection between the firstconductive layer 122 and the second conduction layer 142 of the secondelectrode plate 14. Changes in voltages in the first direction of thefirst conductive layer 142 and the second direction of the secondconductive layer 142 can be detected by the first controller 30. Thenthe first controller 30 transforms the changes in voltages intocoordinates of the pressing point, and sends the coordinates of thepressing point to the CPU 40. The CPU 40 then sends out commandsaccording to the coordinates of the pressing point and further controlsthe display of the display element 20.

The properties of the carbon nanotubes and the carbon nanotubes crossedin the adjacent two carbon nanotube layers provide superior toughness,high mechanical strength, and uniform conductivity to the at least twocarbon nanotube layers. Thus, the touch panel and the display deviceadopting the at least two carbon nanotube layers are durable and highlyconductive. Further, the pulling method for fabricating the carbonnanotube film is simple and the adhesive carbon nanotube film can belocated on the substrate directly without the use of a separate bondingmeans. As such, the method for fabricating the carbon nanotube film issuitable for the mass production of touch panels and display device andreduces the cost thereof. Furthermore, the carbon nanotube film has ahigh transparency, thereby promoting improved brightness of the touchpanel and display device. Finally, since the carbon nanotubes haveexcellent electricity conductive property, the carbon nanotube layerformed by a plurality of carbon nanotubes oriented along a samedirection and uniformly distributed therein has a uniform resistancedistribution and thus the touch panel and display device adopting thecarbon nanotube layer have an improved sensitivity and accuracy.

Finally, it is to be understood that the above-described embodiments areintended to illustrate rather than limit the invention. Variations maybe made to the embodiments without departing from the spirit of theinvention as claimed. The above-described embodiments illustrate thescope of the invention but do not restrict the scope of the invention.

It is also to be understood that above description and the claims drawnto a method may include some indication in reference to certain steps.However, the indication used is only to be viewed for identificationpurposes and not as a suggestion as to an order for the steps.

1. A touch panel comprising: a first electrode plate comprising a firstsubstrate and a first conductive layer located on a lower surface of thefirst substrate; and a second electrode plate separated from the firstelectrode plate and comprising a second substrate and a secondconductive layer located on an upper surface of the second substrate;wherein at least one of the first conductive layer and the secondconductive layer comprising at least two stacked carbon nanotube layers,each carbon nanotube layer comprising a plurality of carbon nanotubesaligned in a single direction, and the carbon nanotubes in the twoadjacent carbon nanotube layers being aligned in different directions.2. The touch panel as claimed in claim 1, wherein an angle between thealigned directions of the carbon nanotubes in the two adjacent carbonnanotube layers approximately ranges from above 0° to less than or equalto 90°.
 3. The touch panel as claimed in claim 1, wherein the carbonnanotube layer comprises a carbon nanotube film or a plurality ofcoplanar carbon nanotube films.
 4. The touch panel as claimed in claim3, wherein the carbon nanotube film comprises a plurality ofsuccessively oriented carbon nanotube segments joined end to end by vander Waals attractive force therebetween, and each carbon nanotubesegment comprises the plurality of carbon nanotubes that are combined byvan der Waals attractive force therebetween.
 5. The touch panel asclaimed in claim 3, wherein a thickness of the carbon nanotube filmapproximately ranges from 0.5 nanometers to 100 micrometers.
 6. Thetouch panel as claimed in claim 1, wherein the carbon nanotubes in thecarbon nanotube layer can be selected from a group consisting ofsingle-walled carbon nanotubes, double-walled carbon nanotubes, andmulti-walled carbon nanotubes.
 7. The touch panel as claimed in claim 6,wherein diameters of the single-walled carbon nanotubes approximatelyranges from 0.5 nanometers to 50 nanometers, diameters of thedouble-walled carbon nanotubes approximately ranges from 1 nanometer to50 nanometers, and diameters of the multi-walled carbon nanotubesapproximately ranges from 1.5 nanometers to 50 nanometers.
 8. The touchpanel as claimed in claim 1, wherein the first electrode plate furthercomprises two first-electrodes located separately at opposite ends ofthe first conductive layer thereof, a second direction is perpendicularto a first direction, and each of the two first-electrodes is orientedalong the second direction and electrically connected to the firstconductive layer.
 9. The touch panel as claimed in claim 8, wherein thesecond electrode plate further comprises two second-electrodes locatedseparately at opposite ends of the second conductive layer thereof, andeach of the two second-electrodes is oriented along the first directionand electrically connected to the second conductive layer.
 10. The touchpanel as claimed in claim 1, further comprising an insulative layerlocated between the first and second electrode plates, and theinsulative layer insulates the first electrode plate from the secondelectrode plate.
 11. The touch panel as claimed in claim 10, wherein oneor more of dot spacers are separately located between the firstconductive layer and the second conductive layer.
 12. The touch panel asclaimed in claim 1, further comprising a shielding layer located on alower surface of the second substrate, and the material of the shieldinglayer is selected from the group consisting of indium tin oxide,antimony tin oxides, and a carbon nanotube films.
 13. The touch panel asclaimed in claim 1, further comprising a transparent protective filmlocated on an upper surface of the first electrode plate, and thematerial of the transparent protective film is selected from the groupconsisting of silicon nitride, silicon oxide, benzocyclobutenes,polyester film and polyethylene terephthalate.
 14. A display devicecomprising: a touch panel comprising: a first electrode plate comprisinga first substrate and a first conductive layer located on a lowersurface of the first substrate; a second electrode separated from thefirst electrode plate and comprising a second substrate and a secondconductive layer located on an upper surface of the second substrate;and wherein at least one of the first and second conductive layerscomprising at least two stacked carbon nanotube layers, each carbonnanotube layer comprising a plurality of carbon nanotubes aligned alongan axis, and the carbon nanotubes in the two adjacent carbon nanotubelayers being aligned along different axes; and a display elementadjacent to the touch panel.
 15. The display device as claimed in claim14, further comprising a first controller, a central processing unit,and a second controller; the display element is connected to the firstcontroller, and the central processing unit is connected to the secondcontroller.
 16. The display device as claimed in claim 14, wherein thetouch panel is spaced from the display element with a distance.
 17. Thedisplay device as claimed in claim 14, wherein the touch panel islocated on the display element.
 18. The display device as claimed inclaim 14, further comprising a passivation layer located on a surface ofthe touch panel, and the material of the passivation layer beingselected from the group consisting of silicon nitride and silicondioxide.